Renin
Renin is an enzyme playing an important role in the body’s mineral, salt and water (fluid) balance. It participates in the body's renin-angiotensin-aldosterone system (RAS). renin determination can be used in investigation of pathogenesis of hypertension, oedema and other homeostatic disturbances, in differential diagnosis of hypertension and together with aldosterone determination also for differentiation of primary and secondary hyperaldosteronism.